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T > TANDY RADIO SHACK  > TRS 80 MODEL 16   


Tandy Radio Shack
TRS 80 MODEL 16

The Model 16 was the same as a Model 12 with the 68000 add-on. It was launched a few time after the Tandy TRS 80 model IV. The Z80 processor was used for I/O. Up to four hard disks could be connected (8.4 mb each). It was compatible with the Tandy TRS 80 model II thanks to the Z80 and could run the Model II operating system.

This 68000 chip set and associated memory were much more than a speed improvement. It created a multi-user Unix-based system (actually Xenix, which was just a scaled down Unix). Interestingly, Xenix was developed in part by Microsoft, it was probably the basis upon which some Unix-like functionalities were added to MS-DOS 2.0, like sub-directories, pipes and re-direction.

The 16/6000 had a maximum memory capacity of 768K, and up to 9 serial ports for external terminals. These limits were partly just physical, due to limited card slot space. The 3-port serial cards had jumpers that would have allowed quite a few of them given an external card cage (never produced).

The 768K memory limit was later bumped to 1 MB when 64K memory chips became available. The original machine used a memory card of 256KB populated with 16K chips, and cables were available to support up to three cards. With 64K chips only one card was needed to give 1 MB of memory. Operating system limitations prevented using multiple 1 M cards to expand further in user memory space, but it was possible with software to utilize up to an additional 7 MB of memory as the system "swapper" which, given only 1 MB of user space, was almost always a source of performance loss if handled by the hard drive.

Thanks to Mark Brumlik for the main part of information.



NAME  TRS 80 MODEL 16
MANUFACTURER  Tandy Radio Shack
TYPE  Home Computer
ORIGIN  U.S.A.
YEAR  1982
BUILT IN LANGUAGE  None
KEYBOARD  full stroke keyboard
CPU  Zilog Z80 A + Motorola MC 68000
SPEED  4 MHz (Z80) + 6 MHz (68000)
RAM  128 KB (up to 512 KB)
ROM  Unknown
TEXT MODES  40 or 80 columns x 24 lines
GRAPHIC MODES  Unknown
COLORS  Monochrome
SOUND  Unknown
SIZE / WEIGHT  Unknown
I/O PORTS  Centronics, RS232 (2)
BUILT IN MEDIA  One or Two 8'' floppy disk drives
OS  New DOS / Xenix
POWER SUPPLY  Built-in power supply unit
PERIPHERALS  Memory cards up to 7 MB
PRICE  Unknown

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